Degenerative Myelopathy (Degenerative Damage to the Spinal Cord’s Neural Pathways) in Dogs
- Occurrence: very rare
- Location of illness: Back/Tail
Degenerative myelopathy (DM) is a progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. neurological disease that leads to damage of the nerve pathways in the spinal cordThe spinal cord is a long, narrow bundle of nerve tissue located in the spinal canal of the vertebral column. It is part of the central nervous system and transmits nerve impulses between the brain and body. of dogs, ultimately leading to paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. of the hind legs.
The most important facts at a glance
Degenerative myelopathy is a progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. neurological disease that primarily occurs in older dogs of certain breeds such as the German Shepherd and the Boxer. It is similar to amyotrophic lateralLateral refers to the side of the body or a body part, as opposed to medial, which describes a position closer to the midline of the body. In veterinary medicine, it is used to describe the location of structures or injuries. sclerosisSclerosis refers to the hardening of tissues or organs, often due to chronic inflammation, fibrosis, or degenerative changes. Sclerotic changes can impair the function of the affected tissue. (ALS) in humans and leads to a degeneration of the white matter in the spinal cordThe spinal cord is a long, narrow bundle of nerve tissue located in the spinal canal of the vertebral column. It is part of the central nervous system and transmits nerve impulses between the brain and body., which causes loss of motor coordination. Genetic factors, especially a mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits. in the SOD1 gene, play a significant role in the development of the disease. A genetic test can help confirm the presence of this mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits., but not all dogs with the mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits. develop the disease.
Symptoms include uncoordinated movements, weakness, and muscle wasting in the hind legs, while complete paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. can also occur in advanced stages. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made by excluding other causes and through genetic testing. There is no cure, but supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures such as physiotherapyVeterinary physiotherapy encompasses a range of treatment methods aimed at improving the mobility and well-being of animals through exercise, massage, and other manual techniques., walking aids, and nutritional supplements can improve quality of life.
The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is unfavorable, as the disease can lead to complete paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. within six months to two years. Preventive measures focus on genetic testing and responsible breeding to reduce the risk in future generations. Research is currently investigating genetic and therapeutic approaches to slow or stop the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease, with stem cell therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. considered promising.
Causes
Degenerative myelopathy is a disease that mainly occurs in older dogs, especially in certain breeds such as the German Shepherd, Pembroke Welsh Corgi, Boxer, and Rhodesian Ridgeback. The disease begins in middle to old age, typically from around eight years of age.
From a scientific perspective, DM is comparable to amyotrophic lateralLateral refers to the side of the body or a body part, as opposed to medial, which describes a position closer to the midline of the body. In veterinary medicine, it is used to describe the location of structures or injuries. sclerosisSclerosis refers to the hardening of tissues or organs, often due to chronic inflammation, fibrosis, or degenerative changes. Sclerotic changes can impair the function of the affected tissue. (ALS) in humans. It leads to a progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. degeneration of the white matter in the spinal cordThe spinal cord is a long, narrow bundle of nerve tissue located in the spinal canal of the vertebral column. It is part of the central nervous system and transmits nerve impulses between the brain and body.. This degeneration affects the myelinated axons responsible for transmitting nerve impulses, leading to a loss of function.
The exact cause of degenerative myelopathy is not yet fully understood. However, it is believed that genetic factors play a significant role. A defect in the superoxide dismutase 1 (SOD1) gene has been identified as a significant risk for developing the disease. This genetic marker can be detected in affected dogs and carriers, indicating a hereditary component.
Environmental influences and other genetic factors could also play a role in triggering or exacerbating the disease, although these connections are not yet fully understood. Research in this area is ongoing to develop a better understanding of the pathogenesisPathogenesis describes the process of the origin and development of a disease, including the mechanisms that lead to the disease's symptoms and signs..
Symptoms
Degenerative myelopathy usually begins insidiously with slight signs of weakness in the hind legs. This can manifest as a wobbly or unsteady gait that progresses over time.
Over time, the weakness can develop into complete paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. of the hind legs. Dogs may also have difficulty getting up or climbing stairs. In advanced stages, the front legs may also be affected.
Other symptoms may include a loss of proprioception, i.e. the ability to recognize the position of one’s limbs in space, as well as a loss of bladder and bowel control. Pain is usually not a direct symptom of the disease, as the nerve pathways that transmit pain signals are not primarily affected.
Diagnosis
The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of degenerative myelopathy is made by excluding other possible causes for the neurological symptoms. This includes a complete neurological examination, imaging procedures such as X-rays, MRI or CT, and, if necessary, a cerebrospinal fluidCerebrospinal fluid is a clear, colorless liquid that surrounds and protects the brain and spinal cord. It acts as a shock absorber and is involved in regulating the chemical environment of the CNS (central nervous system). examination.
A genetic test can be performed to confirm the presence of the SOD1 mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits. associated with DM. While the presence of this mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits. supports the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., it is not decisive on its own, as not all dogs with the mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits. develop the disease.
Electrophysiological tests can also be used to assess nerve conduction to determine the degree of neurological impairment.
Therapy
Currently, there is no cure for degenerative myelopathy, and treatment focuses on supporting and improving the quality of life of the affected dog.
PhysiotherapyVeterinary physiotherapy encompasses a range of treatment methods aimed at improving the mobility and well-being of animals through exercise, massage, and other manual techniques. can help maintain muscle massIn pathology, the term "mass" is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer). and improve mobility, which can slow the progression of the disease. Regular exercises specifically tailored to the dog’s needs can also be beneficial.
Additional supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures may include the use of walking aids or wheelchairs to promote the dog’s mobility. Supplements and certain medications can be used to support neurological health, although their effectiveness may vary.
Prognosis and follow-up care
The prognosis for dogs with degenerative myelopathy is unfortunately unfavorable. The disease generally progresses within six months to two years after the onset of the first symptoms, ultimately leading to complete paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system..
The dog’s quality of life can be improved through supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures such as physiotherapyVeterinary physiotherapy encompasses a range of treatment methods aimed at improving the mobility and well-being of animals through exercise, massage, and other manual techniques. and mobility aids. The decision on the right time for humane euthanasia depends on many factors, including the dog’s quality of life and the owners’ ability to provide the necessary care.
Prevention
The preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of degenerative myelopathy focuses primarily on genetic testing and responsible breeding. By identifying carriers of the SOD1 mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits., breeders can make informed decisions to reduce the risk of the disease in future generations.
Some breeding associations and organizations recommend genetic testing for dogs of certain breeds that are susceptible to DM. This allows breeders to avoid pairings that could increase the risk of producing affected offspring.
There are currently no specific environmental measures that have been shown to reduce the risk of developing DM in dogs. Nevertheless, generally promoting neurological health through a balanced diet and regular exercise could be beneficial.
Outlook on current research
Degenerative myelopathy (DM) is a progressive neurological disease that primarily affects older dogs. It affects the white matter of the spinal cordThe spinal cord is a long, narrow bundle of nerve tissue located in the spinal canal of the vertebral column. It is part of the central nervous system and transmits nerve impulses between the brain and body. and leads to a progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. loss of motor coordination. In recent years, research has made significant progress in better understanding the genetic and molecular basis of this disease.
A major focus of current research is on genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases.. A mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits. in the SOD1 gene has been found to be strongly associated with the occurrence of DM. This genetic link has made it possible to develop DNADNA (deoxyribonucleic acid) is the molecule that carries the genetic instructions for the development, function, and reproduction of all known living organisms and many viruses. It is located in the cells of an organism and contains the information for heredity. tests that can determine the risk of the disease in certain dog breeds. Based on these findings, researchers are working to develop genetic therapies that could potentially slow or stop the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease.
Another significant area of research is the development of new therapeutic approaches. Currently, there is no cure for DM, but various experimental treatments are being tested. These include neuroprotective drugs that could slow the degeneration of nerve fibers, as well as physical therapies aimed at maintaining the mobility of affected dogs.
Stem cell therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. is also being investigated as a promising approach. Animal studies have shown that administering stem cells into the spinal cordThe spinal cord is a long, narrow bundle of nerve tissue located in the spinal canal of the vertebral column. It is part of the central nervous system and transmits nerve impulses between the brain and body. can promote the regeneration of nerve tissue. Although these therapies are still in the early stages of development, they offer hope for future treatment options.
In addition to genetic and therapeutic research, scientists are also investigating the environmental factors that could influence the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of DM. Factors such as diet, exercise, and lifestyle could play a role in modulating disease severity. Long-term studies that take these factors into account could help develop preventive strategies that reduce the risk or progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease.
Collaboration between veterinarians, geneticists, and neurologists is crucial for progress in this area. Interdisciplinary research approaches make it possible to better understand the complex mechanisms of DM and to develop innovative solutions. While a complete cure for degenerative myelopathy is still in the future, advances in research are promising and could one day lead to more effective treatments.
Frequently asked questions (FAQs)
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What is Degenerative Myelopathy? Degenerative myelopathy is a progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. neurological disease that affects the nerves in the spinal cordThe spinal cord is a long, narrow bundle of nerve tissue located in the spinal canal of the vertebral column. It is part of the central nervous system and transmits nerve impulses between the brain and body. of dogs, leading to a loss of motor coordination.
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Which dog breeds are most commonly affected? German Shepherds, Welsh Corgis, Boxers, and other large dog breeds are most commonly affected. However, the disease can also occur in other breeds.
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What are the early signs of Degenerative Myelopathy? The first signs are often subtle changes in the dog’s gait, such as stumbling or difficulty getting up. As it progresses, it can lead to complete paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. of the hind legs.
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How is Degenerative Myelopathy diagnosed? DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made by excluding other diseases that could cause similar symptoms, as well as through genetic tests that can detect the SOD1 mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits..
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Is there a cure for Degenerative Myelopathy? There is currently no cure for DM. Treatment focuses on supporting quality of life through physiotherapyVeterinary physiotherapy encompasses a range of treatment methods aimed at improving the mobility and well-being of animals through exercise, massage, and other manual techniques. and, if necessary, the use of aids such as wheelchairs.
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Can medications cure the disease or stop its progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms.? There are currently no medications that can cure DM. However, some medications may help relieve symptoms or slightly slow the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease.
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How can I help my dog with DM? Regular physical therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., a balanced diet, and adapting the living environment can help improve the quality of life of a dog with DM. The use of special aids can also be useful.
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Is the disease painful for my dog? Degenerative myelopathy does not cause direct pain, as the disease affects the nerves responsible for movement, but not pain sensation. However, secondary problems, such as pressure sores, can cause pain.
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Can I reduce the risk of my dog developing DM? Since DM has a genetic component, it is difficult to eliminate the risk completely. However, responsible breeding management and genetic testing can reduce the risk in the populationIn veterinary medicine, the term population refers to a group of animals of a particular species living in a specific geographic area or environment..
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What current research approaches are there to combat DM? Research focuses on genetic therapies, neuroprotective drugs, stem cell therapies, and the study of environmental factors to slow or prevent the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease.
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.